A heavy-duty recirculating ball dual-mode electric power steering device

Abstract

The invention provides a heavy ball circuit type dual-mode electric power steering device which comprises a steering gear shell assembly, an input shaft and screw rod assembly, a toothed fan axle assembly, a support base assembly, a turbine, a worm, an inner end cover assembly, a corner torque sensor, an outer end cover assembly, a spline adapter sleeve assembly and a motor assembly. The motor assembly is taken as a power source, the turbine and the worm are used for transferring the power to the input shaft and screw rod assembly, the input shaft and screw rod assembly is used for outputting torque and angular displacement through the toothed fan axle, and the input shaft and screw rod assembly has two control modes of angle position and torque assistance. In the heavy ball circuit type dual-mode electric power steering device provided by the invention, a large reduction ratio mechanism and the corner torque sensor are adopted for replacing a rotary valve structure in a ball circuit type hydraulic power steering gear, so that without increasing additional space, the conversion from hydraulic driving to intelligent electric driving is realized; and compared with the ball circuit type hydraulic power steering gear in the same volume, the heavy ball circuit type dual-mode electric power steering device has the advantages that the power requirement is reduced by 300% and the maximum output torque is promoted by 5%.

Description

technical field [0001] The invention belongs to the application field of electromechanical systems and motor vehicles, and in particular relates to a heavy-duty circulating ball type dual-mode electric power steering device. Background technique [0002] From the perspective of the automobile industry, as the number of fuel vehicles continues to grow, vehicle emissions are causing more and more serious pollution to the environment. At the same time, oil, as a non-renewable energy source, is also facing the crisis of depletion. Vehicles and hybrid vehicles have become the focus of the government and society because of their advantages of energy saving and environmental protection, and have become the core development theme of today's wheeled vehicle technology. Electric power steering technology (EPS) has been widely used in domestic and foreign household vehicles due to its significant advantages such as high integration, energy saving, and maintenance-free, but it is mostly...

AI Technical Summary

Problems solved by technology

Due to practical factors such as the large load on the steering axle of heavy vehicles (generally more than 4 tons) and the singleness of the layout of the power steering device (usually located in the power cabin), the use of rack and pinion steering devices or steering column steering devices cannot meet the requirements. , it is necessary to adopt a recirculating ball structure with high overall structural strength and strong impact resistance, and the current recirculating ball steering structure only exists in heavy-duty hydraulic power steering devices and has nothing to do with electric power steering systems

[0007] 2. The structural strength requirements of key components and parts are high, and the system matching is difficult

As far as the recirculating ball hydraulic power steering is concerned, its screw, gear fan shaft, housing, steering nut and other components are often damaged due to external impact loads

[0008] 3. Electromechanical matching is difficult

Images